SpaceXAI releases Grok 4.5, an Opus class model trained with Cursor data

SpaceXAI launched Grok 4.5 for coding and agentic work at $2 per million input and $6 output, scoring 54 on the Artificial Analysis Intelligence Index behind only Fable 5, GPT-5.5 and Opus 4.8. It is the first model built jointly with Cursor, which SpaceX is acquiring for $60 billion.